methyl 2-amino-5-bromobenzoate

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 2-Amino-5-bromobenzoic acid methyl ester (4.6 g, 20 mmol) and copper (I) cyanide (3.6 g, 40 mmol) were heated at 200° C. in N-methylpyrrolidinone (20 ml) for 4 h. After cooling to room temperature, the solution was diluted with water, extracted with ethyl acetate, the aqueous extract acidified with 2N hydrochloric acid and filtered. The organic layer was separated, dried over magnesium sulphate and evaporated. The residue was purified by flash column chromatography on silica eluting with 50% ethyl acetate in hexane to yield the title compound as a colourless oil (1.0 g). MS (+El) m/z 176 [M+]. extracted with ethyl acetate the aqueous extract filtered The organic layer was separated dried over magnesium sulphate evaporated The residue was purified by flash column chromatography on silica eluting with 50% ethyl acetate in hexane

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Methyl 2-amino-5-bromobenzoate (compound A) (3.0 g) was dissolved in anhydrous methylene chloride (40.0 ml). Subsequently, pyridine (2.1 ml) and 4-(chloromethyl)benzoyl chloride (compound B) (2.2 ml) were added to the solution at room temperature, and the mixture was stirred at that temperature for one hr. After the completion of the reaction, distilled water was added, followed by separatory extraction with chloroform. The organic layer was washed with saturated brine, was dried over sodium sulfate, and was then concentrated to give methyl 5-bromo-2-[3-(chloromethyl)benzoyl]aminobenzoate as a useful intermediate (4.90 g, yield 100%). After the completion of the reaction distilled water was added followed by separatory extraction with chloroform The organic layer was washed with saturated brine was dried over sodium sulfate was then concentrated